When I placed my hoe in my off hand to work with Beetroots, I found expected that the hoeing animation would be the same in the left as the right, you swing your hoe and the dirt is ready for planting.

However, Instead of swinging my hoe, I swung my right hand, which happened to be empty. (This is in f5 mode. First person the hoe swings in your left, like it's supposed to.)

All you need to do to recreate this bug, place a hoe in your off hand, go into 3rd person, and till the ground.
(Sorry, my PC is too old for videos)